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740 Turbo symptoms 700 1986

posted by  Paltell on  Wed Mar 9 06:29 CST 2005
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I just added a 745 Turbo to my Volvo rear drive fleet. I have an 87 245 with 312K, a 93 945T with 200K and now, a very sweet 745T with 200K. The turbos have AW 71 automatic trannies and the standard 230FT 4 cylinder engines. The 745 has a Garrett turbo and everything under the hood looks original, including vacuum and intercooler hoses. The new addition runs fine, except when I get on the turbo. Boost looks normal...the guage works and climbs from black to orange to red as I accelerate. However, as boost increases, I'm getting a pretty loud high-pitched whine and the engine hesitates, then stumbles and boost disappears. I'm not blowing smoke (white, black or blue). Thus, the only symptoms of trouble are the whine and the stumbling. The harder I get on the turbo, the worse the symptoms.

I suspect leaking turbo hoses, but would like some thoughts from listmembers regarding diagnosis and repair.

Thanks in advance






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New 740 Turbo symptoms [700][1986]
posted by  Paltell  on Wed Mar 9 06:29 CST 2005 >


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